gets you into this sort of defensive medicine mode, and i'm a parent of 2 teenagers. "i want a clean bill of health. that's my little girl. are you sure there's nothing you're missing?" "well, i can't be 100% sure. "i can tell you the neurologic exam was normal, "but there's a 1-in-5,000 chance there could be a small bleed that i'm missing." "well, yeah, i want the test." hoffman: when i do all sorts of tests that i don't really think are abnormal, some of them are going to look abnormal just by chance. that's just how it is. and when they do look abnormal, i'm forced to do things to you that many times will cause you harm and only rarely will do any benefit. james: imaging or testing in inappropriate circumstances just exposes you to the risks of false positives, and working up those false positives kills people. sometimes. not often, thank heavens. there's this, oh, deeply embedded belief that it's all upside. no. ok, relax. ok. all finished. all done? so, melissa, you had your big birthday this year where you turned 40. i did. and from age 40 on, little present tha